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* But Mao never fought as the other warlords fought. Though they all double-crossed and intrigued, they also observed certain amenities. They disliked to take each other prisoner, settled battles with silver bullets (.i.e., cash bribes), often left one city gate open for retreat when they had surrounded a rival, even provided transport for the defeated general's belongings (they hoped for a return of the courtesy in reversed circumstances), considered it boorish to attack in bad weather. Mao fought for keeps.